
Mathler
Find the calculation that makes the day's answer, with Wordle colours, at four levels
Nerdle turns Wordle into maths: you guess a hidden equation and the tiles tell you which digits and signs are right. The closest games hide a calculation or a code behind the same coloured clues; after them come daily puzzles where you build a sum to hit a target.

Find the calculation that makes the day's answer, with Wordle colours, at four levels

Crack a hidden number code from green, yellow and grey feedback, longer each day of the week

Four- and five-digit locks to open with coloured clues in a set number of goes

Reach a target from six numbers and the four operations, four times a day

Combine six number tiles to hit the target, scored against the day's par

Open a lock from other people's scored attempts, by deduction alone

Mastermind solved from a transcript of scored attempts, six levels a day

Guess a colour's six-character hex code with Wordle-style hints

Give each letter a number so every equation holds, a step towards algebra

Find a mystery number from distances written in chemical elements

The original maths Wordle, for anyone who arrived here first
Mathler is the nearest relative. You are told the answer and have to find the calculation that makes it, in six tries, with green, yellow and grey tiles like Nerdle's. It comes at four levels each day, from easy to killer, so you can pick how long it takes.
If what you like in Nerdle is the deduction from coloured feedback, the code games are next. D3C1PH3R hides a number code that grows through the week, from three digits on Monday to six on Sunday, with a daily leaderboard. Padlock gives four- and five-digit locks to crack in a set number of goes. Crack the Code and Codebreaker turn the idea around: you get other people's failed attempts and their scores, and deduce the code without guessing at all. Hexcodle uses the same feedback on a colour's hex code, which turns out to be a number puzzle in disguise.
If you would rather build the equation yourself, Abako and Parithmetic both hand you six numbers and a target, the old Countdown numbers round. Parithmetic scores you like golf against the day's par; Abako has four challenges a day and a harder round on Sunday. Logic Equations asks you to give each letter its own number so that a set of equations holds, closer to algebra than arithmetic.
For something stranger, Periodic Times Table hides a number and tells you how far off each guess is in chemical elements. Start with Mathler and D3C1PH3R beside your Nerdle; both take a few minutes and reward the same habits.
Mathler has a killer level every day, and D3C1PH3R gets longer through the week, up to a six-digit code with 15 guesses on Sunday.
Crack the Code, Codebreaker and Logic Equations can be solved by deduction from the clues given.
Yes, all of them are free to play in a browser; some show ads.